Upon further inspection, it turns out that the lower (secondary) fold shown in Figure REF  at \(Wi \approx 30\)  is purely a feature of the polymer diffusion term \(1/(ReSc) \Delta \otimes C\)  growing artificially large (as \(Re\)  is decreased), the effect of which is already known to destroy small scale dynamics [1]}. It turns out that the point at which the saddle-node bifurcation occurs can be delayed arbitrarily by adjusting \(Sc\)  in accordance with the variations in \(Re\)  to keep the polymer diffusion finite. Numerical experimentation suggested a revised polymer diffusion term of the form
\(\frac{\lambda }{Wi} \Delta \otimes \) 
